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toxic sites

You are probably all aware of a site concept that offers no real info, only some search results that are probably grabbed from google, instead it contains optimized targeted pages for keywords that are built based on referer keywords that a pages gets.

For example: toxicmold.ca - this site presents itself as a search engine and builds pages depending on what referers it gets. I noticed this site some months ago when they were in top10 for a large of stock market/investing searches.

Now I see they look banned from google and their Alexa reach chart looks this took place around 20 april this year since they have almost dropped to 0.

Do you know any similar sites? How profitable you think this type of sites are?
I am very tempted to start such a site, but I am woried why they got banned, if it is for the way they generate pages or for the way they optimized.